CN111221245A - Setting machine fuzzy PID tension control parameter self-tuning method based on PSO - Google Patents
Setting machine fuzzy PID tension control parameter self-tuning method based on PSO Download PDFInfo
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Abstract
The invention discloses a PSO-based setting machine fuzzy PID tension control parameter self-tuning method, which comprises the following steps: s1: selecting a discrete PID control algorithm according to the characteristics of the tension control system of the setting machine; s2: setting a fuzzy control regulation with an adjusting factor, and optimizing the adjusting factor by using a particle swarm algorithm; s3: and obtaining a global optimal position and a corresponding PID value, and substituting the value into a discrete PID control algorithm to control the tension of the setting machine. The method combines the PSO algorithm and the traditional fuzzy PID algorithm and is applied to a tension control system of the setting machine; aiming at the fuzzy PID control algorithm of the nonlinear discrete system of the setting machine, a fuzzy rule with a correction factor is established, in order to obtain the optimal fuzzy rule, the correction factor in the fuzzy rule is optimized by adopting a PSO algorithm, and then the optimal fuzzy rule is obtained, so that the tension control system of the setting machine has the characteristics of real-time adjustment, high control precision and easy realization in engineering.
Description
Technical Field
The invention relates to the field of setting machine tension control, in particular to a PSO-based setting machine fuzzy PID (proportion integration differentiation) tension control parameter self-tuning method.
Background
With the rapid development of economy and science and technology in China, the paper is more and more required by various industries in production and life, and the requirement on the paper quality is higher and higher. The diluted pulp fiber is dewatered by the polyester fiber net to form wet paper, so the quality of the polyester fiber net directly determines the quality of the paper. The polyester fiber net is a polyester fiber net which is formed by weaving polyester monofilaments into a primary net by a weaving machine, and the primary net is changed into the polyester fiber net which can be used in the paper making industry after primary and secondary setting by a heat setting machine. Therefore, when the polyester fiber web is shaped, the real-time performance and the precision of the tension control system of the shaping machine determine the quality of the paper.
Most of the existing setting machine tension control systems adopt a PID control algorithm, and the PID control algorithm can only carry out lag adjustment, cannot predict the occurrence of disturbance and cannot compensate the disturbance in advance, so that the setting machine tension control system cannot be adjusted in real time. Aiming at the defects of the traditional PID control algorithm, a setting machine tension control system based on neural network control and a setting machine tension control system based on fuzzy control are respectively developed, but the setting machine tension control system based on neural network control needs on-line learning, so that the transition process is slow, the adjustment cannot be quickly realized, and the engineering is difficult to realize; in the setting machine tension control system based on fuzzy control, the fuzzy rule is set artificially, so that the control precision is low, and the tension is difficult to control to reach a desired target value.
Therefore, a control algorithm which has real-time adjustment, high stability precision and is easy to implement in engineering is urgently needed, and is applied to a tension control system of a setting machine to solve the problems of time lag, low control precision and difficulty in implementation in engineering of the tension control system of the existing setting machine.
Disclosure of Invention
The invention provides a PSO-based setting machine fuzzy PID tension control parameter self-tuning method, which solves the problems of time lag, low control precision and unsuitability for engineering realization of the existing setting machine tension control system.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a PSO-based setting machine fuzzy PID tension control parameter self-tuning method comprises the following steps:
s1: selecting a discrete PID control algorithm according to the characteristics of the tension control system of the setting machine;
s2: setting fuzzy control regulation with an adjusting factor, and optimizing the adjusting factor by using a Particle Swarm Optimization (PSO);
s3: and obtaining a global optimal position and a corresponding PID value, and substituting the value into a discrete PID control algorithm to control the tension of the setting machine.
Preferably, the discrete PID control algorithm in step S1 is:
in the formula, u (k) is output, e (j) is a jth sampling error, j is more than or equal to 0 and less than or equal to k, e (k) is a kth sampling error, e (k-1) is a kth-1 sampling error, T is sampling time, k is a sampling sequence number, and k is a sampling timepProportional value, k, of discrete PIDiIs an integral value of a discrete PID, kdIs the differential value of a discrete PID.
Preferably, the fuzzy control rule with the adjustment factor in step S2 is:
where u is the output, u is u (k), E is the error, E is E (k), EC is the amount of error change, δ1、δ2、δ3、δ4For the correction factor, the interval is (0, 1).
Preferably, in step S2, the particle swarm algorithm is used to optimize the adjustment factor, specifically:
s2.1: when the particle swarm algorithm is used for optimizing, a group of deltas1、δ2、δ3、δ4Is a particle;
s2.2: initializing the value of a PID controller of a setting machine tension control system, the independent variable number of an objective function, the number of particle swarms, the speed and the position of each particle and the maximum iteration number;
s2.3: setting a fitness function, and calculating a fitness function value of each particle in a tension control system of the setting machine;
s2.4: updating the current optimal position of the particles and the global optimal position of the particles according to the set fitness function, updating the PID value corresponding to each particle according to the fuzzy control rule and the discrete PID control algorithm, and updating the position value and the speed value of each particle;
s2.5: judging whether the current iteration times are smaller than the maximum iteration times, if so, returning to S2.3, and continuing to circulate; if not, ending the circulation and executing the step S2.6;
s2.6: obtain the global optimal position and obtain the corresponding PID controller value, which is the desired kp、ki、kdThe value is obtained.
Preferably, the PID value corresponding to each particle is updated in step S2.4, and the position value and velocity value of each particle are updated:
in the formula (I), the compound is shown in the specification,
is the component of the position vector for the ith particle and the kth iteration,
is the component of the velocity vector of the ith particle, the kth iteration, α1、α2Is an acceleration coefficient, and takes a value according to the actual situation, r1、r2Is a random function with a value range of [0,1 ]]And w is the coefficient of inertia,
is the historical best position value of the particle found at the kth iteration of the ith particle,
is the global optimum found for the ith particle at the kth iteration.
Preferably, the fitness function in step S2.3 is:
F＝|yout-y|
in the formula, youtIs the actual tension value output by the setting machine, and y is the set value of the tension of the setting machine.
Preferably, the global optimal value in S3 is obtained as:
calculating the fitness function value of each current particle, comparing the fitness function value of each current particle with the fitness function value corresponding to the historical optimal position of the particle before updating, and if the fitness function value corresponding to the historical optimal position of the particle before updating is higher, updating the historical optimal position value of the particle to be the position value of the current particle; and comparing the fitness function value of each current particle with the fitness function value corresponding to the global optimal position of the particle before updating, and updating the position value of the current particle to be the global optimal value if the fitness function value corresponding to the global optimal position of the particle before updating is higher.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the method combines the PSO algorithm and the traditional fuzzy PID algorithm and is applied to a tension control system of the setting machine; aiming at the fuzzy PID control algorithm of the nonlinear discrete system of the setting machine, a fuzzy rule with a correction factor is established, in order to obtain the optimal fuzzy rule, the correction factor in the fuzzy rule is optimized by adopting a PSO algorithm, and then the optimal fuzzy rule is obtained, so that the tension control system of the setting machine has the characteristics of real-time adjustment, high control precision and easy realization in engineering.
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FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1 to 2, the present embodiment provides a fuzzy PID tension control parameter self-tuning method for a setting machine based on PSO, which includes the following steps:
s1: selecting a discrete PID control algorithm according to the characteristics of the tension control system of the setting machine;
s2: setting fuzzy control regulation with an adjusting factor, and optimizing the adjusting factor by using a Particle Swarm Optimization (PSO);
s3: and obtaining a global optimal position and a corresponding PID value, and substituting the value into a discrete PID control algorithm to control the tension of the setting machine.
Preferably, the discrete PID control algorithm in step S1 is:
in the formula, u (k) is output, e (j) is a jth sampling error, j is more than or equal to 0 and less than or equal to k, e (k) is a kth sampling error, e (k-1) is a kth-1 sampling error, T is sampling time, k is a sampling sequence number, and k is a sampling timepProportional value, k, of discrete PIDiIs an integral value of a discrete PID, kdIs the differential value of a discrete PID.
Preferably, the fuzzy control rule with the adjustment factor in step S2 is:
where u is the output, u is u (k), E is the error, E is E (k), EC is the amount of error change, δ1、δ2、δ3、δ4For the correction factor, the interval is (0, 1).
Preferably, in step S2, the particle swarm algorithm is used to optimize the adjustment factor, specifically:
s2.1: when the particle swarm algorithm is used for optimizing, a group of deltas1、δ2、δ3、δ4Is a particle;
s2.2: initializing the value of a PID controller of a setting machine tension control system, the independent variable number of an objective function, the number of particle swarms, the speed and the position of each particle and the maximum iteration number;
s2.3: setting a fitness function, and calculating a fitness function value of each particle in a tension control system of the setting machine;
s2.4: updating the current optimal position of the particles and the global optimal position of the particles according to the set fitness function, updating the PID value corresponding to each particle according to the fuzzy control rule and the discrete PID control algorithm, and updating the position value and the speed value of each particle;
s2.5: judging whether the current iteration times are smaller than the maximum iteration times, if so, returning to S2.3, and continuing to circulate; if not, ending the circulation and executing the step S2.6;
s2.6: obtain the global optimal position and obtain the corresponding PID controller value, which is the desired kp、ki、kdThe value is obtained.
Preferably, the PID value corresponding to each particle is updated in step S2.4, and the position value and velocity value of each particle are updated:
in the formula (I), the compound is shown in the specification,
is the component of the position vector for the ith particle and the kth iteration,
is the component of the velocity vector of the ith particle, the kth iteration, α1、α2Is an acceleration coefficient, and takes a value according to the actual situation, r1、r2Is a random function with a value range of [0,1 ]]And w is the coefficient of inertia,
is the historical best position value of the particle found at the kth iteration of the ith particle,
is the global optimum found for the ith particle at the kth iteration.
Preferably, the fitness function in step S2.3 is:
F＝|yout-y|
in the formula, youtIs the actual tension value output by the setting machine, and y is the set value of the tension of the setting machine.
Preferably, the global optimal value in S3 is obtained as:
calculating the fitness function value of each current particle, comparing the fitness function value of each current particle with the fitness function value corresponding to the historical optimal position of the particle before updating, and if the fitness function value corresponding to the historical optimal position of the particle before updating is higher, updating the historical optimal position value of the particle to be the position value of the current particle; and comparing the fitness function value of each current particle with the fitness function value corresponding to the global optimal position of the particle before updating, and updating the position value of the current particle to be the global optimal value if the fitness function value corresponding to the global optimal position of the particle before updating is higher.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A PSO-based setting machine fuzzy PID tension control parameter self-tuning method is characterized by comprising the following steps:
s1: selecting a discrete PID control algorithm according to the characteristics of the tension control system of the setting machine;
s2: setting a fuzzy control regulation with an adjusting factor, and optimizing the adjusting factor by using a particle swarm algorithm;
s3: and obtaining a global optimal position and a corresponding PID value, and substituting the value into a discrete PID control algorithm to control the tension of the setting machine.
2. The PSO-based setter fuzzy PID tension control parameter self-tuning method as claimed in claim 1, wherein the discrete PID control algorithm in step S1 is:
in the formula, u (k) is output, e (j) is a jth sampling error, j is more than or equal to 0 and less than or equal to k, e (k) is a kth sampling error, e (k-1) is a kth-1 sampling error, T is sampling time, k is a sampling sequence number, and k is a sampling timepProportional value, k, of discrete PIDiIs an integral value of a discrete PID, kdIs the differential value of a discrete PID.
3. The PSO-based setting machine fuzzy PID tension control parameter self-tuning method of claim 2, wherein the fuzzy control rule with the adjustment factor in step S2 is:
where u is the output, u is u (k), E is the error, E is E (k), EC is the amount of error change, δ1、δ2、δ3、δ4For the correction factor, the interval is (0, 1).
4. The PSO-based setting machine fuzzy PID tension control parameter self-tuning method of claim 3, wherein in step S2, the particle swarm algorithm is used to optimize the adjustment factor, specifically:
s2.1: when the particle swarm algorithm is used for optimizing, a group of deltas1、δ2、δ3、δ4Is a particle;
s2.2: initializing the value of a PID controller of a setting machine tension control system, the independent variable number of an objective function, the number of particle swarms, the speed and the position of each particle and the maximum iteration number;
s2.3: setting a fitness function, and calculating a fitness function value of each particle in a tension control system of the setting machine;
s2.4: updating the current optimal position of the particles and the global optimal position of the particles according to the set fitness function, updating the PID value corresponding to each particle according to the fuzzy control rule and the discrete PID control algorithm, and updating the position value and the speed value of each particle;
s2.5: judging whether the current iteration times are smaller than the maximum iteration times, if so, returning to S2.3, and continuing to circulate; if not, ending the circulation and executing the step S2.6;
s2.6: obtain the global optimal position and obtain the corresponding PID controller value, which is the desired kp、ki、kdThe value is obtained.
5. The PSO-based setter fuzzy PID tension control parameter self-tuning method of claim 4, characterized in that in step S2.4, the PID value corresponding to each particle is updated, and the position value and the speed value of each particle are updated:
in the formula (I), the compound is shown in the specification,
is the component of the position vector for the ith particle and the kth iteration,
is the component of the velocity vector of the ith particle, the kth iteration, α1、α2Is an acceleration coefficient, and takes a value according to the actual situation, r1、r2Is a random function with a value range of [0,1 ]]And w is the coefficient of inertia,
is the historical best position value of the particle found at the kth iteration of the ith particle,
is the global optimum found for the ith particle at the kth iteration.
6. The PSO-based setter fuzzy PID tension control parameter self-tuning method of claim 5, characterized in that the fitness function in step S2.3 is:
F＝|yout-y|
in the formula, youtIs the actual tension value output by the setting machine, and y is the set value of the tension of the setting machine.
7. The PSO-based setting machine fuzzy PID tension control parameter self-tuning method of claim 6, wherein the global optimum value in S3 is obtained as follows:
calculating the fitness function value of each current particle, comparing the fitness function value of each current particle with the fitness function value corresponding to the historical optimal position of the particle before updating, and if the fitness function value corresponding to the historical optimal position of the particle before updating is higher, updating the historical optimal position value of the particle to be the position value of the current particle; and comparing the fitness function value of each current particle with the fitness function value corresponding to the global optimal position of the particle before updating, and updating the position value of the current particle to be the global optimal value if the fitness function value corresponding to the global optimal position of the particle before updating is higher.
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| CN104834215A (en) * | 2015-03-24 | 2015-08-12 | 浙江师范大学 | Variation particle swarm optimized BP neural network proportion integration differentiation (PID) control algorithm |
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